I drain the fuel lines and fuel cell only....I put antifreeze in and about once a week turn on the electric water pump and spin the engine over a few times...that way there is no need to back off on the valves and not be able to spin the engine over during the 4-6 weeks of winter here in Alabama.

This was just my 2nd year to run alcohol but this year after each race I drained my fuel cell & lines. The drops left on the funnel you use to put the alcohol in with would I guess pull moister out of the air. I went from the 99.9% like they sell at the track to VP still would do it.